/Engine/Source/Runtime/Engine/Public/MaterialHLSLTree.h
FExpressionNoise ( const [FNoiseParameters](API\Runtime\Engine\FNoiseParameters) & InParams, const [FExpression](API\Runtime\Engine\HLSLTree\FExpression) * InPositionExpression, const [FExpression](API\Runtime\Engine\HLSLTree\FExpression) * InFilterWidthExpression )